Afghanistan awoke to a series of early-morning attacks on Sunday, as insurgents set off three suicide bombs in separate outlying provinces. Officials stopped a fourth attack, shooting and killing a man in a sport-utility vehicle thought to be carrying explosives. In the deadliest of the attacks, a car bomb exploded near a state intelligence site, killing two guards and wounding three others. Although the death toll from the three attacks was low, they illustrate the continued unrest inside the nation. A spokesman for the group, Zabiullah Mujahid, confirmed that they were behind the three successful bombings.